Mouthpiece for voice-pipes



No. 753,113. PATENTBD FEB. 23, 1904.

T. w. BATTINQ MOUTHPIEGE FOR VOICE PIPES.

APPLICATION FILED JULY 29, 1902.

NO MODEL.

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UNITED STATES Patented February 23, 1904.

PATENT ()EEIC I VIOUTHPIECE FOR VOICE-PIPES.

SPECIFICATION forming part of Letters Patent No. 753,113, dated February 23, 1904:.

Application filed July 29, 1902. Serial No. 117,548. (No model.)

To all whom it may concern:

Be it known that I, THoMAs WILSONBATTIN, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented new and useful Improvements in Mouthpieces for Voice- Pipes, of which the following is a specification.

This invention relates to a mouthpiece attachment for a voice-pipe or speaking-tube; and it consists in the construction and arrangement of the several parts, which will be more fully hereinafter described and claimed.

In the drawings, Figure 1 is a top plan view of a mouthpiece embodying the features of the invention. Fig. 2 is a longitudinal vertical section on the line a 00, Fig. 4. Fig. 3 is a side elevation of the same. Fig. 4 is a front elevation of the mouthpiece shown open. Fig. 5 is a front elevation of the mouthpiece shown closed.

Similar numerals of reference are employed to indicate corresponding parts in the several views.

The improved device comprises a tubular body 1, having a surrounding guard-flange 2 and adapted to be inserted in a voice-pipe or speaking-tube, the body 1 being of hollow cylindrical form and having an interior diameter correspondingto that of the voice-pipe. The mouthpiece is shown in the present instance as comprising a straight body 1; but it will be understood that said body may be curved. In advance of the flange 2 the body has an upper vent-opening 3, over which is disposed a gravitating telltale 4 for indicating to an operator, where a number of mouthpieces are assembled in close relation, which one is to be used or requires response, and below the telltale is another opening or vent 5, leading to a pneumatic signal or whistle 6. The operation of the signal 6 will be readily understood as being due to the pneumatic pressure established in the .voice pipe and transmitted through the body 1, and simultaneous with the operation of the signal 6 the telltale 4 will be thrown upwardly and remain standing until disposed in normal closed position by the operator.

Projecting laterally from the outer end of the body 1 is a fulcrum flange or projection 7,

and to the said flange or projection the essential part of the invention 1s movably attached by means of a pivot-hinge. This essential part of the invention comprises a closing plate or member 8, having a pivot-pin 9 passed therethrough and through the outer portion of the flange or projection 7. The pivotpin 9 is passed through the closing-plate 8 adjacent one edge, and in view of this eccentric attachment of the plate the greater portion thereof will be to one side of the pivot or hinge connection therefor. Consequently the plate by its weight will always have a normal tendency to gravitate or move downwardly when free to so operate, and thereby close the outer end of the body 1. Through the lower extremity of the plate a circular opening 10 is formed and has a diameter precisely equal to that of the opening through the body 1, and surrounding this circular opening 10 is an elliptical mouth-receiver 11, which is outwardly flared and assists in delivering into the tube 1 the full-voice tone when the plate 8 is raised to bring the opening 10 in coincidence with the outer open end of the body 1 and also adds to the weight of the plate 8 and insures a do wnward movement of the latter when released by the operator, the additional weight of the receiver 11 being imposed on the plate 8 be low the pivot 9, as clearly shown by Fig. 5. It is necessary to check the downward movement of the plate 8, and for this purpose a stoplug 12, having a square shoulder 13, projects from the edge of the plate at apoint opposite the location of the pivot-pin 9, said stop projection contacting with an outstanding shoulder or striker 14, supported by the body and extending from the latter.

The improved mouthpiece is simple and effective in its construction and operation and will form a valuable acquisition to the art to which it pertains.

A material advantage in the improved mouthpiece is that the pneumatic signal or whistle does not in the least obstruct the orifice or opening of the body 1, and when the plate 8 is elevated to bring the opening 10 in coincidence with the outer open end of the body 1 full circular opening without interior obstruction of any kind is produced.

Having thus fully described the invention, what is claimed as new is* A mouthpiece for a voice-pipe comprising a body having a surrounding guard-flange and a laterally-projectingflange on one of its ends, said body having alining apertures in advance of the guard-flange, a gravitating gate or telltale hinged to the body and disposed over one of the apertures, a signal communicating with IO the other opening, an outstanding shoulder extending from the face of the body, an eccentric closlng-plate having an opening through 

